Boot connector designed to be cast in radial progression and method and apparatus for its production and use

ABSTRACT

A gasket having an intermediate portion provided with convolutions which are capable of expanding/contracting enabling an anchoring end to be cast in a curve and a pipe receiving end to be maintained lying in a plane, and a method for forming and using the gasket including the employment of a mandrel assembly to conform the anchoring end to the curvature of the cast member.

CROSS REFERENCE TO RELATED APPLICATION(S)

[0001] This application is a Divisional/Continuation in Part and claimspriority from patent application Ser. No. 09/533,424, filed Mar. 22,2000; which claims priority from U.S. Provisional Patent Application No.60/125,860, filed Mar. 24, 1999 which are incorporated by reference asif fully set forth.

FIELD OF INVENTION

[0002] The present invention relates to boot connectors capable of beingcast in radial progression within the curved wall of a cast member.

BACKGROUND

[0003] Cast members, such as, for example, manhole assemblies, have beentraditionally used in sewage systems and networks and the like and arecomprised of manhole assemblies having openings each adapted to receivea pipe to provide for inflow and outflow of fluid. It is conventional toprovide gaskets within the aforesaid openings which cooperate with thepipe pushed therethrough to form a fluid-tight seal, both the advantagesand necessities for a fluid-tight seal being well known in such sewagesystems and the like.

[0004] With the constant desire to reduce the cost of both themanufacturing and materials employed in the production of cast membersbeing ever present, one of the traditional approaches has been toproduce gaskets of reduced size and hence reduced rubber (or rubberlike) content. One such gasket is described in U.S. Pat. No. 5,529,312,which patent teaches a gasket having a boot portion which is folded overto lie against a main gasket portion preparatory to casting. The gasketis placed upon a mandrel secured to one of the walls forming the moldassembly. The wall is moved to the closed position whereupon the castmaterial, (typically concrete) is poured into the mold. The moldassembly is opened after the cast material has cured. The boot portionis then unfolded preparatory to use. A pipe is pushed through the gasketincluding the boot portion. A steel clamp is preferably placed aroundthe boot portion to provide a fluid-tight seal.

[0005] In order to reduce the amount of rubber utilized in the gasketdisclosed in the aforementioned '312 patent, the overall size of itsopening may be reduced; however, in order to provide a capability ofcontrolling opening size, permissible annular deflection and permissibleradial deflection, the only parameter of the '312 gasket which may beregulated is gasket thickness.

[0006] It is therefore extremely desirable to provide a gasket which iscapable of controlling opening size, and annular and radial deflectionthrough variation of a gasket parameter other than gasket thickness.

[0007] The gasket of the present invention, comprises an annular-shapedbase portion having integral an anchoring portion extending radiallyoutward there from. The base portion is shaped to form a substantiallyU-shaped radius portion having an annular-shaped boot portion integrallyjoined to the radius portion and extending in a generally axialdirection. The free end of the boot portion is provided with an annularend portion defining a clamp receiving portion. The gasket is typicallymade of a suitable rubber or rubber-like material of a suitabledurometer such as 40 to 45 durometer.

[0008] In order to produce a cast member having the aforesaid gasketanchored therein, a mandrel assembly is provided, which assembly iscomprised of an inner mandrel which is a truncated conical shapedmember. The inner mandrel is also a truncated, conical shaped member hasa recess for receiving the boot end of the gasket.

[0009] The outer mandrel, having a substantially truncated, hollow,conical configuration, cooperates with the inner mandrel to retain thegasket in the proper position within the mold assembly and to formtapered conical-shaped openings on opposite sides of the anchoringportion. The boot portion of the gasket is folded over and placedagainst outer mandrel. The inner mandrel is placed against the radiusportion of the gasket on the convex side thereof. A retaining memberholds the mandrel halves together. The portion of the boot which wouldotherwise extend outwardly from the outer mandrel is folded in and isheld in that state to avoid any interference with the casting operation.The “pushed-inward” portion of the boot is held in place between themandrel halves by suitable threaded nut which threadedly engages thethreaded member. The combined mandrel assembly and gasket is placedwithin a casting mold by conventional means.

[0010] The cast material is then poured into the mold. Once the castmaterial has been cured, the mold is opened and the mandrel assembly isdisassembled and removed, enabling the inwardly curved boot portion toresume its normal, substantially annular-shaped configuration.

[0011] A pipe is pushed through the gasket to a depth sufficient toassure that the pipe extends beyond the free end of the boot, enablingthe boot to be firmly secured to the pipe extending there through bymeans of stainless steel take-down clamp which is tightened to an extentsufficient to assure a fluid-tight seal which meets and, in fact,surpasses ASTM specifications.

[0012] While, the above-described technology is extremely advantageousfor use in flat wall structures as well as curved wall structures whenthe piping seal allows for the connector to be installed in a flatplane, in applications where the embedment portion must be cast inradial progression, it is not possible to install a take-down clamp in aflat plane.

SUMMARY

[0013] The present invention is directed to a gasket in which the bootportion is provided with a plurality of convolutions which enable thefluid stop portion of the gasket to be cast on a severe curve while thepipe receiving end supporting a stainless steel take down clamp iscapable of being secured in a flat plane, the convolutions serving as aresilient “buffer” region between the clamp receiving portion and thecurved anchoring portion of the gasket. The gasket may either beextruded or molded so that its profile is the same as the configurationof the gasket when in use. The gasket is held in a compressed statewithin the mandrel assembly during casting to avoid interference whichother members employed in the casting operation and is moved to itsnormal state readiness for receiving a pipe.

BRIEF DESCRIPTION OF THE DRAWING(S)

[0014]FIG. 1 is an exploded view of one embodiment of the gasket of thepresent invention and the mandrel assembly utilized therewith;

[0015]FIG. 2 is an enlarged sectional view showing the gasket of FIG. 1in greater detail; and the manner in which the gasket embraces a pipe.

[0016]FIG. 3 is a cross-section of another embodiment of the invention;

[0017]FIG. 4 is shows the assembled gasket of FIG. 3 arranged within amandrel;

[0018]FIG. 5 is a top plan view of a portion of the gasket of FIG. 3embedded in a curved cast member and receiving a corrugated pipe;

[0019]FIGS. 6 and 6a are cross-sections of other embodiments of theinvention;

[0020]FIG. 7 is a sectional view showing the manner in which the gasketof FIG. 6 is arranged preparatory to insertion into a mandrel assembly;

[0021]FIG. 8 is a sectional view showing the gasket of FIG. 7 arrangedwithin a mandrel assembly;

[0022]FIG. 9 shows the gasket after the mandrel assembly is removed;

[0023]FIG. 10 is a top plan view of a portion of the gasket of FIG. 6embedded in a curved cast member and receiving one of a corrugated orsmooth pipe; and

[0024]FIGS. 11 and 12 are sectional views showing further embodiments ofthe invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT(S)

[0025] An object of the present invention is to provide a gasket havinga profile which is obtained by either molding or extrusion that willallow the anchoring portion of the gasket to be cast in a curve whennecessary to thereby provide a boot type gasket for use in a curved wallof a precast concrete structure. There are a number of gaskets presentlyin the market place that allow boot type gaskets to be cast in flatwalls and to be cast in a flat configuration in curved walls or circularwalls when their embedment profile portion or section can remain in aflat plane. However, such curved or circular structures have theirlimitations and, when a pipe size requiring sealing is greater than thedistance that the geometry of the wall will accommodate in a flat plane,it is critical that a connector anchoring portion of the gasket haveadequate and proper concrete cover along both opposing sides thereof inorder to assure a positive, fluid-tight seal at the interface of thegasket and the concrete wall. Although connectors can be custom moldedto the radius needed to accommodate a curved or circular wall, custommoldings are very expensive. It therefore becomes extremely advantageousto provide a profile that can be extruded or molded and it willaccommodate various pipe sizes as well as radii thereby providing anextremely economical solution.

[0026] Making reference to FIGS. 1 and 2, there is shown therein agasket/mandrel assembly 10 embodying the principles of the presentinvention and which is comprised of a gasket 12, an outer mandrel 14,and an inner mandrel 16.

[0027] Gasket 12 is an annular-shaped gasket having a base portion 12 a.Extending in an outward radial direction there from is an inverted,substantially cross-shaped anchoring portion 13 including integralprojections 13 a, 13 b and 13 c which, as will be more fully describedherein below, become embedded within the cast member to secure thegasket thereto and provide a fluid-tight seal between the gasket and thecast member.

[0028] Base portion 12 a has integrally joined thereto, a curved portion12 b to provide a U-shaped, radius portion which then, relative to FIGS.1 and 2, extends generally toward the right to form an integral bootportion 12 c having a shallow, corrugation-like interior surface portion12 e and a pair of rounded projections or beads 12 f, 12 g, whichprovide a recessed portion 12 h therebetween, upon which a stainlesssteel take-down clamp C, shown in FIG. 2, is located, as will be morefully described.

[0029] The gasket is a molded (or extruded) gasket and is formed of asuitable rubber or rubber-like material of a suitable durometer toprovide a rugged, resilient, compressible gasket member capable ofproviding an excellent fluid-tight seal between the gasket and a pipe,as will be more fully described below.

[0030] In applications where casting of the gasket in a curvedconfiguration is required, the gasket 12 is employed. Gasket 12 isprovided with several convolutions 12 i, 12 j, 12 k, 12l, in the regionbetween radius portion 12 c and the end portion of the boot whichreceives the steel hold-down clamp C. The convolutions allow the fluidstop area of the connector to be cast in a curve, i.e., the anchoringportions 13 a, 13 b and 13 c, while the clamp area of the connectorremains a relatively flat plane to accept the stainless steel take-upclamp C. FIG. 1 shows an exploded top plan view of the manner in whichthe gasket 12 is mounted so that the anchoring portion 3 is cast in acurve. Placement mandrels 14, 16 have a curvature of a given radiusbuilt into the outside mandrel 14 and inside mandrel 16 which conform tothe curvature of the concrete wall W, which curvature is represented bythe dotted center line CL.

[0031] The inner and outer mandrels 14 and 16 are joined with the gasket12 therebetween. The boot portion of the gasket is manually pressedinward. Conventional threaded members or the like, not shown, join themandrel halves 14, 16 together to retain the boot portion in the“pressed in” state. Production of the cast member is thus quiteconventional, except for the fact that the anchoring portion 13 of thegasket is embedded in a concrete wall having significant curvature(curve CL), as opposed to gaskets cast into a flat wall or cast in aflat configuration in a curved wall.

[0032] After the cast member has been set and cured, the mandrels 14 and16 are removed (after unthreading the cooperating threaded members)whereupon the boot portion of the gasket retains its originalconfiguration, shown in both FIGS. 1 and 2.

[0033] A pipe P only a portion of which is shown in FIG. 2, is insertedinto the boot portion and the stainless steel take-down clamp C isplaced in recess 12 h and then appropriately tightened to provide anexcellent fluid-tight seal between the boot and the pipe. Pipe P has asmooth cylindrical outer surface. The convolutions 12 i-12 l permit theintermediate portion of the boot to form deeper or shallower bends tocompensate for the fact that the anchoring and base portion of thegasket follows the curvature CL, while enabling the stainless steeltake-down clamp C to be maintained in a substantially flat plane.

[0034] Extruding the profile of the gasket as shown in FIGS. 1 and 2makes it possible to provide a shape that offers a number of functionalproperties which include:

[0035] The extrusion is extruded in the shape of its final intended use;

[0036] Once extruded and spliced to form a connector, the pipe receivingend is rotated 180° and locked into place within the mandrel assemblywhich allows the connector to:

[0037] have a significantly reduced length measured in the direction ofthe central axis CA of the gasket which is significantly greater indiameter than in width enabling the connector to be positioned in acurved configuration with a radial progression while minimizingdistortion; and

[0038] the hole forming equipment is also used to set a diameterrelationship placing the embedment portion of the connector greater thanthat of the pipe receiving end.

[0039] Once the connector is cast and the hole forming equipment isremoved, the connector then reassumes its normal configuration as shownin FIGS. 1 and 2, in readiness to receive a pipe and a clamping memberC.

[0040]FIGS. 3 and 4 show another embodiment of the present invention.

[0041] Gasket 22 has a base portion 22 a and an anchoring portion 23integrally joined thereto and provided with what maybe referred to as a“double T” configuration comprised of a central arm 23 a and integral,outwardly projecting portions 23 b through 23 e. Base portion 22 aextends toward the left of the anchoring portion to form a lockingdovetail 22 b and further extends to the right of the anchoring portionwhere it is integrally joined with the boot portion which is comprisedof a plurality of convolutions 22 i through 22 m, the boot portionterminating in a pipe receiving end 22 c having a substantially C-shapedconfiguration to provide a recess 22 h for receiving a hold-down clamp,such as, for example, the hold clamp C shown in FIG. 2.

[0042] It should be understood that, when forming the gasket employingan extrusion process, the extrusion is cut to a given length and then isformed into a ring-like configuration, the free ends being fusedtogether, as is conventional, to form an annular shaped gasket.

[0043] In order to form a cast member with the gasket embedded therein,the pipe receiving end 22 c is moved as shown by the dotted arrow A tobring the pipe receiving end into the position wherein its end-mostportion 22 d is locked into the locking dovetail 22 b, shown in FIG. 4.The gasket is then placed into the mandrel assembly comprised of outsidemandrel 24 and inside mandrel 26. The mandrel halves are joined togetherby suitable locking means, not shown, the anchoring portion 23 extendingoutside the exterior walls 24 a, 26 a of the mandrel members while theremainder of the gasket is retained in the locked position withincooperating recesses provided in the mandrel halves 24, 26. Suitablefastening members such as threaded fasteners (not shown) retain themandrel halves in the assembled position. The assembly is then placed ina suitable mold assembly into which the cast material is placed. Themold assembly may, for example, be used to form a manhole base.

[0044] After the cast material (typically concrete) has been set andcured, the mold assembly and the mandrel halves are removed. The pipereceiving end 22 c of the gasket is then unlocked and pulled out toassume the position shown in FIG. 3, which is the normal position of thegasket when receiving a pipe.

[0045] A pipe is pushed through the boot portion by an appropriatedistance and a clamp is placed within recess 22 h to effect afluid-tight seal between the gasket and the pipe. An effectivefluid-tight seal is also provided between the anchoring portion 23 ofthe gasket and the cast member.

[0046] The final orientation is shown in FIG. 5 which is a top plan viewof a portion of the gasket showing a curved wall W of the cast memberwith the anchoring portion 13 embedded therein and with a pipe P of acorrugated type positioned within the gasket and shown just prior tosecuring the pipe receiving end to the corrugated pipe.

[0047] Corrugated pipe P has a plurality of alternating peaks Pk andvalleys V interspersed between the peaks Pk. Both the peaks and valleyseach lie substantially within a plane, necessitating that the pipereceiving end similarly lies in a flat plane in order to ensure that thepipe receiving end fits snugly within a valley, such as valley V inorder ensure a fluid-tight seal. The convolutions 22 i through 221provide the necessary yieldability to ensure that the pipe receiving endlies substantially in a flat plane. Noting the top view of FIG. 5, itcan be seen that the anchoring portion 13 is further removed from thepipe receiving end at the position POS 1, which if viewed from an endview of the pipe P looking toward the pipe receiving end 22 c, thiswould be considered to be the “3 o'clock” position. Moving around theanchoring position to the position POS2 which may be considered to bethe “6 o'clock” position, the anchoring portion 13 is significantlycloser to the pipe receiving portion 22 c and, in fact, this “6 o'clock”position is the position at which the anchoring portion 13 is closer tothe pipe receiving portion than any other position about the opening.Although not shown for purposes of simplicity it should be understoodthat moving “clockwise” from the “6 o'clock” position to the “9 o'clock”position, which is the mirror image of the “3 o'clock” position POS 1,shown in FIG. 5, the anchoring portion is then furthest removed from thepipe receiving portion. To complete the circle, moving to the “12o'clock” position, which is a mirror image of the “6 o'clock” positionshown as POS2 in FIG. 5, the distance between the anchoring portion 13and the pipe receiving portion 22 c constitutes the minimal distancebetween anchoring portion 13 and pipe receiving portion 22 c. In orderto enable these configurations to be retained when in use while furtherassuring an excellent fluid-tight seal, the convolutions 22 i-221respectively either move closer together or further apart to maintainthe integrity of the seal between portions 13 and 22 c. The convolutionsmay be likened to an “accordion pleated” configuration which is capableof expansion/contraction.

[0048] It should be noted that the pipe receiving portion mayalternatively embrace a pipe P having a smooth cylindrical surface asshown in dotted fashion in FIG. 2 or a peak P_(k) of a corrugated pipe,as set forth below.

[0049]FIGS. 6 through 11 show still further embodiments of the presentinvention.

[0050] Making reference to FIG. 6, the gasket 30 has an anchoringportion 33 joined to base 38 which forms a substantially U-shapedconfiguration 30 b which is integrally joined to the convolutions 30 ithrough 30 m, which convolutions terminate in pipe receiving portion 30c. As with the prior embodiment, the gasket is extruded (or molded) inthe configuration shown in FIG. 6 which is the configuration of thegasket when placed into final use.

[0051] The base 30 a further extends to the right forming an integrallocking portion 30 p.

[0052] In order to embed the anchoring portion of gasket 30 within acurved wall, the pipe receiving end of gasket 30 is rotated around fromthe position shown in FIG. 6 to the position shown in FIG. 7 and ispushed toward the locking portion 30 p causing the convolutions tocollapse in the manner shown. The convolutions are pushed inward and areplaced within an annular cavity formed inside mandrel 36 as shown inFIG. 8. The outside mandrel 34 is then pressed against the gasket 30 andis joined together with inside mandrel 36, through any suitable couplingmeans. The mandrel assembly is then placed in the mold assembly whichmay, for example, be a manhole assembly form. The cast material isplaced in the mold and, after the cast material has been set, the moldmembers (not shown) and the mandrel halves are removed. The gasket thenoccupies the position shown in FIG. 9 wherein the anchor portion 33 isembedded within the curved wall in a curved orientation.

[0053] The pipe receiving end 32 c is then pulled to the right relativeto FIG. 9 and is moved to the position shown in FIG. 10 in readiness toreceive a pipe which may either be a pipe having an outer cylindricalsurface or a corrugated pipe of the type shown in FIG. 5. The pipereceiving portion 32 c is placed within one of the valleys of thecorrugated pipe and hold down clamp C as shown in FIG. 5, retains thepipe receiving end within the associated valley P′ shown in FIG. 5 toeffect an excellent fluid-tight seal. Substantially the same seal isobtained when clamping the gasket to a pipe having a smooth (i.e.uncorrugated) outer peripheral surface.

[0054] As was set forth above in connection with the embodiment shown inFIG. 5, the curved orientation in which the anchoring portion 13 isembedded within the curved wall W of the cast member the pipe receivingend 32 c is furthest removed from the pipe receiving portion 32 c in the“3 o'clock” position POS 1 of FIG. 10, while being closest to, the pipereceiving portion at the “6 o'clock” position POS 2, the convolutions 32i to 32 m providing the requisite expansion/contraction to achieve theabove orientation and thereby provide an excellent fluid-tight sealbetween the opening in the curved wall W and the pipe secured to theboot portion of the gasket, shown for example in FIG. 5.

[0055]FIG. 5 shows the pipe receiving portion 32 c in readiness to bepositioned within a valley V¹ of corrugated pipe P. FIG. 6a shows agasket 30′ of the type shown in FIG. 6 and being mounted upon one of thepeaks P_(k) of a corrugated pipe P using a take-down clamp 40 similar tothe arrangement shown in U.S. Pat. No. 6,406,025 (Patent '0,25), issuedJun. 18, 2002 to the assignee of the present invention. Otherarrangements for mounting the gasket of the present invention oncorrugated pipe are shown in the '025 patent which is incorporatedherein by reference.

[0056]FIGS. 12 and 13 show a casting technique which is somewhatmodified from that shown in FIGS. 6-11.

[0057] Although the gasket employed in the technique shown in FIGS. 12and 13 is substantially identical to the gasket shown in FIGS. 6-11, themandrels 34′ and 36′ are slightly modified from the mandrels 34 and 36shown in FIG. 8, for example. More particularly, inside mandrel 36′ isprovided with an annular-shaped cavity which provides a snug fit for thegasket except for the pipe receiving portion in order to hold the gasketin position over the inside half of the mandrel. The outside mandrel 34′is then moved into place by moving mandrel half 34′ from the positionshown in FIG. 12 to the position shown in FIG. 13 wherein the pipereceiving portion 30 c is not locked to the portion 30 p andsubstantially assumes the position occupied during normal use.

[0058] As was described above with regard to the technique employing themandrel assembly 34-36 shown in FIG. 8, the mold members and the mandrelmembers are unlocked and removed enabling the gasket to occupy theposition as shown in FIG. 11 in readiness for receiving a pipe.

[0059] All of the gasket embodiments of the present invention furthershare the following advantages which include:

[0060] the ability to allow the pipe to deflect of the order of 15° froma nominal center line CL as shown in FIG. 9;

[0061] the ability to be stretched to pull the piper receiving end awayfrom the opening in the cast member to enable installers to manipulatethe take-down clamp and mounting tools more easily when installing thepipe and the clamp and also to push the pipe receiving end back towardan initial position, if desired, upon completion of the installationsteps.

[0062] A latitude of modification, change and substitution is intendedin the foregoing disclosure, and in some instances, some features of theinvention will be employed without a corresponding use of otherfeatures. Accordingly, it is appropriate that the appended claims beconstrued broadly and in a manner consistent with the spirit and scopeof the invention herein described.

What is claimed is:
 1. A gasket adapted to have one end thereof embeddedin a cast member and another end thereof receiving a pipe to form afluid-tight seal between the cast member and the pipe, comprising: ahollow annular-shaped boot formed of a resilient, compressible material;an annular anchoring potion integral with and projecting radiallyoutwardly from a first annular surface of said boot, said anchoringportion being arranged near one end of said annular-shaped boot andserving as an anchoring end; an opposite end of said boot forming a pipereceiving end and having a recess for receiving a clamp; said boothaving an intermediate portion extending between and integral with theanchoring portion and the pipe receiving end and having a plurality ofconvolutions capable of expanding/compressing to increase/decrease thespacing between the pipe receiving portion and the anchoring portion toenable a center line of the pipe receiving portion to lie substantiallyin a plane while the anchoring portion lies along a curved horizontalpath.
 2. In combination, a cast member having a curved wall, a gasketembedded in the cast member and a pipe extending through said gasket,said gasket comprising: an annular shaped boot having an anchoring endand a pipe receiving end; an anchoring portion joined to said anchoringend and extending substantially radial outwardly therefrom; saidanchoring portion and the end of the boot secured to said anchoringportion lying along a curved line; said pipe extending through andembraced by at least said pipe receiving portion; a hold-down clampsecuring said pipe receiving portion to said pipe to provide afluid-tight seal; said hold-down clamp and said pipe receiving portionlaying substantially in a plane; and a portion of said boot intermediatesaid anchoring end and said pipe receiving end having a plurality ofconvolutions enabling the intermediate portion to collapse at locationsthereof where the pipe receiving portion and the anchoring portion arecloser together and to expand at locations where the pipe receiving endand the anchoring end are further removed from one another, therebyenabling the pipe receiving end to maintain its planar orientation. 3.The combination of claim 2 wherein said pipe is a corrugated pipe havingalternating peaks and valleys, each valley being positioned between apair of adjacent peaks; said pipe receiving portion having a contourgenerally conforming to the contour of a valley and being positionedwithin a valley; and said hold down clamp securing the pipe receivingportion within said valley to provide a fluid-tight seal.
 4. Thecombination of claim 2 wherein said intermediate portion has anaccordion-pleated configuration.
 5. A method for providing a fluid-tightseal between a curved wall and a cast member and a pipe comprising;extruding a gasket for providing a profile comprised of a first endhaving an anchoring portion integrally joined thereto and extending in adirection transverse to said first end; a second end having asubstantially C-shaped configuration to define a pipe receiving end; aportion of said profile intermediate said first and second ends having asubstantially saw-tooth configuration; cutting the extruded member to agiven length; forming the member into an annular shape and bringing thefree ends thereof into alignment; joining the line free ends to form anannular gasket; placing the gasket within a mandrel assembly whichmaintains at least the anchoring portion in a curved contour; placingthe mandrel assembly within a mold assembly for molding a cast memberhaving a curved wall; placing cast material within the mold, said moldforming said curved cast member and said mandrel assembly forming anopening in said curved wall; removing the curved wall from the moldassembly when the cast material has set; removing the mandrel assemblyto thereby provide a curved wall having the anchoring portion embeddedtherein wherein the anchoring portion lies a substantially constantdistance from one of the inner and outer walls of the curved wall;inserting the pipe into the gasket so that at least the pipe receivingportion embraces said pipe; placing a hold-down clamp about an outerperiphery of the pipe receiving portion to secure the pipe receivingportion to the pipe, said pipe receiving portion laying substantially ina plane; and said saw-tooth configuration of said profile forming apolarity of convolutions which expand in regions where the anchoringportion is a greater distance from the pipe receiving portion and whichcontract in regions where the pipe receiving portion is closer to saidanchoring portion.
 6. The method of the claim 5 wherein said pipe is acorrugated pipe having annular-shaped peaks and valleys and the step ofinserting the pipe into the pipe receiving portion includes placing thepipe receiving portion of the gasket in an annular-shaped valley of saidcorrugated pipe and the step of securing the pipe receiving portion tothe pipe includes securing the pipe receiving portion within said valleyto assure a fluid-tight seal.
 7. The method of claim 5 wherein thegasket is extruded so that its profile is substantially the same as theprofile of the gasket when cast into the curved wall and ready toreceive said pipe.
 8. The method of claim 5 wherein the gasket is moldedso that its profile is substantially the same as the profile of thegasket when cast into the curved wall and ready to receive said pipe. 9.A method for providing a fluid-tight seal between a curved wall and acast member and a pipe comprising; extruding a gasket for providing aprofile comprised of a first end having an anchoring portion integrallyjoined thereto and extending in a direction transverse to said firstend; a second end having a substantially C-shaped configuration todefine a pipe receiving end; said first end having a U-shaped portionadjacent to said anchoring portion; a portion of said profileintermediate said U-shaped portion and said second end having asubstantially saw-tooth configuration; cutting the extruded member to agiven length; forming the member into an annular shape and bringing thefree ends thereof into alignment; joining the aligned free ends to forman annular gasket.
 10. The method of claim 9 further comprising: placingthe annular gasket within a mandrel assembly which maintains at leastthe anchoring portion in a curved contour; placing the mandrel assemblywithin a mold assembly for molding a cast member having a curved wall;placing cast material within the mold, said mold forming said curvedcast member and said mandrel assembly forming an opening in said curvedwall; removing the curved wall from the mold assembly when the castmaterial has set; removing the mandrel assembly to thereby provide acurved wall having the anchoring portion embedded therein wherein theanchoring portion lies a substantially constant distance from one of theinner and outer walls of the curved wall; inserting the pipe into thegasket so that at least the pipe receiving portion embraces said pipe;placing a hold-down clamp about an outer periphery of the pipe receivingportion to secure the pipe receiving portion to the pipe, said pipereceiving portion laying substantially in a plane; and said saw-toothconfiguration of said profile forming a polarity of convolutions whichexpand in regions where the anchoring portion is a greater distance fromthe pipe receiving portion and which contract in regions where the pipereceiving portion is closer to said anchoring portion.
 11. The method ofthe claim 10 wherein said pipe is a corrugated pipe havingannular-shaped peaks and valleys and the step of inserting the pipe intothe pipe receiving portion includes placing the pipe receiving portionof the gasket in an annular-shaped valley of said corrugated pipe andthe step of securing the pipe receiving portion to the pipe includessecuring the pipe receiving portion within said valley to assure afluid-tight seal.
 12. The method of the claim 10 wherein said pipe is acorrugated pipe having annular-shaped peaks and valleys and the step ofinserting the pipe into the pipe receiving portion includes placing thepipe receiving portion of the gasket upon an annular peak of saidcorrugated pipe and the step of securing the pipe receiving portion tothe pipe includes securing the pipe receiving portion against said peakto assure a fluid-tight seal.
 13. The method of claim 10 wherein thepipe inserting step further comprises: pulling the pipe receivingportion away from the opening in the cast member to facilitate mountingand tightening of the take down clamp upon the pipe receiving portion.14. A gasket adapted to have one end thereof embedded in a cast memberand another end thereof receiving a pipe to form a fluid-tight sealbetween the cast member and the pipe, comprising: a hollowannular-shaped boot formed of a resilient, compressible material; anannular anchoring potion integral with and projecting radially outwardlyfrom a first annular surface of said boot, said anchoring portion beingarranged near one end of said annular-shaped boot and serving as ananchoring end; an opposite end of said boot forming a pipe receiving endand having a recess for receiving a clamp; a U-shaped portion providedbetween said anchoring portion and said opposite end; said boot havingan intermediate portion extending between and integral with the U-shapedportion and the pipe receiving end and having a plurality ofconvolutions capable of expanding/compressing to increase/decrease thespacing between the pipe receiving portion and the anchoring portion toenable a center line of the pipe receiving portion to lie substantiallyin a plane while the anchoring portion lies along a curved horizontalpath.
 15. In combination, a cast member having a curved wall, a gasketembedded in the cast member and a pipe extending through said gasket,said gasket comprising: an annular shaped boot having an anchoring endand a pipe receiving end; an anchoring portion joined to said anchoringend and extending substantially radial outwardly therefrom; a U-shapedportion adjacent to said anchoring portion; said anchoring portion andthe end of the boot secured to said anchoring portion lying along acurved line; said pipe extending through and embraced by at least saidpipe receiving portion; a hold-down clamp securing said pipe receivingportion to said pipe to provide a fluid-tight seal; said hold-down clampand said pipe receiving portion laying substantially in a plane; and aportion of said boot intermediate said U-shaped portion and said pipereceiving end having a plurality of convolutions enabling theintermediate portion to collapse at locations thereof where the pipereceiving portion and the anchoring portion are closer together and toexpand at locations where the pipe receiving end and the anchoring endare further removed from one another, thereby enabling the pipereceiving end to maintain its planar orientation.
 16. The combination ofclaim 15 wherein said pipe is a corrugated pipe having alternating peaksand valleys, each valley being positioned between a pair of adjacentpeaks; said pipe receiving portion having a contour generally conformingto the contour of a valley and being positioned within a valley; andsaid hold down clamp securing the pipe receiving portion within saidvalley to provide a fluid-tight seal.
 17. The combination of claim 15wherein said pipe is a corrugated pipe having alternating peaks andvalleys, each valley being positioned between a pair of adjacent peaks;said pipe receiving portion having a contour generally conforming to thecontour of a peak and being positioned upon and encircling said peak;and said hold down clamp securing the pipe receiving portion to saidpeak to provide a fluid-tight seal.
 18. The combination of claim 15wherein said pipe is a cylindrical-shaped pipe having a smooth outersurface; said pipe receiving portion having a surface engaging said pipeouter surface; and said hold down clamp securing the pipe receivingportion to said pipe to provide a fluid-tight seal.
 19. The combinationof claim 15 wherein said intermediate portion has an accordion-pleatedconfiguration.